Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572346
Bong-Yeon Choi, Jung-Min Park, Soon-Ryung Lee, Jun-Hyeok Jegal, C. Won
A current sharing method considering battery state of charge(SOC) for multi-module uninterruptable power supply(UPS) system is proposed. Modularized UPS system consists of a single master module and multi slave modules. A master module performs output voltage control and distributes current commands to slave modules. The current commands are generated by using the proposed current sharing algorithm to balance the SOC of each UPS module. Moreover, the UPS mode transfer time can be significantly reduced by using the predictive current control. The predictive current control method is mathematically verified by analyzing the UPS system. The validity of proposed balancing method and predictive control is verified by simulation results.
{"title":"Current sharing algorithm for parallel operation of single phase UPS inverters using predictive current control","authors":"Bong-Yeon Choi, Jung-Min Park, Soon-Ryung Lee, Jun-Hyeok Jegal, C. Won","doi":"10.1109/INTLEC.2015.7572346","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572346","url":null,"abstract":"A current sharing method considering battery state of charge(SOC) for multi-module uninterruptable power supply(UPS) system is proposed. Modularized UPS system consists of a single master module and multi slave modules. A master module performs output voltage control and distributes current commands to slave modules. The current commands are generated by using the proposed current sharing algorithm to balance the SOC of each UPS module. Moreover, the UPS mode transfer time can be significantly reduced by using the predictive current control. The predictive current control method is mathematically verified by analyzing the UPS system. The validity of proposed balancing method and predictive control is verified by simulation results.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128829975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572279
T. Suetsugu
This paper introduces extension of concept of discrete control method of class E amplifier to the varying load reactance. Previous discrete control method could keep nominal operation of the class E amplifier for varying load resistance. But, it could not apply for the varying load reactance. In this paper, with varying shunt capacitance and output resonant capacitance, discrete control which keeps nominal operation of class E amplifier can be applied to both varying resistance and varying reactance, namely, any variations in the output impedance. Operation of proposed circuit is verified with PSIM simulation.
{"title":"Discrete control of class E amplifier with load fluctuation","authors":"T. Suetsugu","doi":"10.1109/INTLEC.2015.7572279","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572279","url":null,"abstract":"This paper introduces extension of concept of discrete control method of class E amplifier to the varying load reactance. Previous discrete control method could keep nominal operation of the class E amplifier for varying load resistance. But, it could not apply for the varying load reactance. In this paper, with varying shunt capacitance and output resonant capacitance, discrete control which keeps nominal operation of class E amplifier can be applied to both varying resistance and varying reactance, namely, any variations in the output impedance. Operation of proposed circuit is verified with PSIM simulation.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126876343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572425
T. Ushirokawa, K. Yuasa, T. Takeda, Hiroaki Miyoshi, K. Yukita
At the present time, the concept of coordination of photovoltaic generation systems with existing power systems has become the focus of increasing attention. Taking coordination between photovoltaic generation systems and power storage equipment as its theme, this paper elucidates the outlook for control conditions and the recovery of costs with the focus on economic performance and also reports on verification performed based on empirical comparison with the actual charging system.
{"title":"Verification of cost saving for office building using renewable energy and battery system","authors":"T. Ushirokawa, K. Yuasa, T. Takeda, Hiroaki Miyoshi, K. Yukita","doi":"10.1109/INTLEC.2015.7572425","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572425","url":null,"abstract":"At the present time, the concept of coordination of photovoltaic generation systems with existing power systems has become the focus of increasing attention. Taking coordination between photovoltaic generation systems and power storage equipment as its theme, this paper elucidates the outlook for control conditions and the recovery of costs with the focus on economic performance and also reports on verification performed based on empirical comparison with the actual charging system.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126390600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572380
Bjorn Havard Stokke, O. J. Sørdalen, E.B. Skallerud, Morten Schoyen, G. Schmitt
The communication infrastructure is facing an increasing demand for higher bandwidth with larger coverage, both for fixed line xDSL networks and for wireless equipment. Such expansions in bandwidth and coverage introduce higher demand for power at an increasing number of sites. This paper presents and discusses a proposal for how to meet the increasing bandwidth demand with a remote power concept for reduced CAPEX and/or reduced energy losses.
{"title":"High efficiency remote power distribution for telecom infrastructure","authors":"Bjorn Havard Stokke, O. J. Sørdalen, E.B. Skallerud, Morten Schoyen, G. Schmitt","doi":"10.1109/INTLEC.2015.7572380","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572380","url":null,"abstract":"The communication infrastructure is facing an increasing demand for higher bandwidth with larger coverage, both for fixed line xDSL networks and for wireless equipment. Such expansions in bandwidth and coverage introduce higher demand for power at an increasing number of sites. This paper presents and discusses a proposal for how to meet the increasing bandwidth demand with a remote power concept for reduced CAPEX and/or reduced energy losses.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121558721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572319
Chien-Ming Wang, Chien-Iu Lin, Kuan-Yu Chen, Chang-Hua Lin
A ZCS-PWM interleaved boost rectifier with high power factor is proposed in this paper. The pulse-width-modulation technique and soft commutation technique are used in the proposed rectifier to promote the circuit performance. The proposed circuit includes two boost converter which are operated at interleaved mode to increase the output power and reduce the input ripple current. A ZCS-PWM auxiliary circuit is configured in the presented rectifier to provide the ZCS function on main switches and auxiliary switches and improve the problem of switching losses and EMI. A prototype has been implemented in laboratory to verify circuit theory.
{"title":"A ZCS-PWM interleaved boost rectifier","authors":"Chien-Ming Wang, Chien-Iu Lin, Kuan-Yu Chen, Chang-Hua Lin","doi":"10.1109/INTLEC.2015.7572319","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572319","url":null,"abstract":"A ZCS-PWM interleaved boost rectifier with high power factor is proposed in this paper. The pulse-width-modulation technique and soft commutation technique are used in the proposed rectifier to promote the circuit performance. The proposed circuit includes two boost converter which are operated at interleaved mode to increase the output power and reduce the input ripple current. A ZCS-PWM auxiliary circuit is configured in the presented rectifier to provide the ZCS function on main switches and auxiliary switches and improve the problem of switching losses and EMI. A prototype has been implemented in laboratory to verify circuit theory.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126400544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572357
Kwan-Sub Lee, Hyunjin Shin, Jaeho Choi
In this paper, power losses of 3-level NPC inverter (3LNPCI) and 3-level T-type inverter (3LTI) are classified and calculated according to the switching states. The conduction loss depends on modulation index (MI) and power factor (PF), whereas the switching loss depends on switching frequency, so the power loss analyses have been done at the different operating points of MI, PF, and switching frequency. And power losses of 3LNPCI and 3LTI with NPC and T-type inverter dedicated modules are calculated based on the theoretical formula and PSiM thermal module by using the real parameter values of switching devices. For the comparison of power losses of NPC and T-type inverters, all parameters have been referred from the data sheets of the different manufacturing companies.
{"title":"Comparative analysis of power losses for 3-Level NPC and T-type inverter modules","authors":"Kwan-Sub Lee, Hyunjin Shin, Jaeho Choi","doi":"10.1109/INTLEC.2015.7572357","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572357","url":null,"abstract":"In this paper, power losses of 3-level NPC inverter (3LNPCI) and 3-level T-type inverter (3LTI) are classified and calculated according to the switching states. The conduction loss depends on modulation index (MI) and power factor (PF), whereas the switching loss depends on switching frequency, so the power loss analyses have been done at the different operating points of MI, PF, and switching frequency. And power losses of 3LNPCI and 3LTI with NPC and T-type inverter dedicated modules are calculated based on the theoretical formula and PSiM thermal module by using the real parameter values of switching devices. For the comparison of power losses of NPC and T-type inverters, all parameters have been referred from the data sheets of the different manufacturing companies.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126404559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a simple and low cost PV simulator using diode characteristics for development of PV system. In order to reproduce characteristics of PV module, instead of huge digital data of I-V characteristics of PV module considering temperature dependence, a real diode is used in the proposed system. A low cost microcontroller that has a little amount of data memory is used to control the system. The principle of the proposed system is described in detail, and is implemented in a prototype system. Experiments were conducted to show that excellent performances were obtained.
{"title":"Simple and low cost PV simulator using diode characteristics for development of PV system","authors":"Michiharu Kawano, Terukazu Sato, Takayuki Taguchi, Yasuhiro Genzima, Susumu Teramoto","doi":"10.1109/INTLEC.2015.7572475","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572475","url":null,"abstract":"This paper presents a simple and low cost PV simulator using diode characteristics for development of PV system. In order to reproduce characteristics of PV module, instead of huge digital data of I-V characteristics of PV module considering temperature dependence, a real diode is used in the proposed system. A low cost microcontroller that has a little amount of data memory is used to control the system. The principle of the proposed system is described in detail, and is implemented in a prototype system. Experiments were conducted to show that excellent performances were obtained.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122221177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572333
T. Shimada, K. Taniguchi, Kosuke Abe
A circuit topology for a bi-directional isolated DC-DC converter and its operation are proposed and evaluation results are discussed. This converter is based on a voltage-source primary circuit and a current-source secondary circuit with an active clamp circuit. To decrease the lower limit of the input voltage for a large voltage range, the proposed topology uses a “small boost circuit” consisting of only a boosting capacitor and a switch on the secondary side. Only when the input voltage is decreased, the switch is kept in the on-state and the secondary voltage is boosted by using transformer series inductance. A 2-kW prototype converter, which has a previously proposed control and the new small boost circuit of the proposed topology, decreased the input voltage lower limit from 289 to 267 V under maximum output conditions.
{"title":"Small boost circuit topology for expanding input voltage range for a bi-directional isolated dc-dc converter","authors":"T. Shimada, K. Taniguchi, Kosuke Abe","doi":"10.1109/INTLEC.2015.7572333","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572333","url":null,"abstract":"A circuit topology for a bi-directional isolated DC-DC converter and its operation are proposed and evaluation results are discussed. This converter is based on a voltage-source primary circuit and a current-source secondary circuit with an active clamp circuit. To decrease the lower limit of the input voltage for a large voltage range, the proposed topology uses a “small boost circuit” consisting of only a boosting capacitor and a switch on the secondary side. Only when the input voltage is decreased, the switch is kept in the on-state and the secondary voltage is boosted by using transformer series inductance. A 2-kW prototype converter, which has a previously proposed control and the new small boost circuit of the proposed topology, decreased the input voltage lower limit from 289 to 267 V under maximum output conditions.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126029955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572343
Seyed Ahmad Hamidi, A. Nasiri
In this paper, stability analysis of a typical DC/DC Boost converter feeding a Constant Power Load (CPL) with and without a Battery Energy Storage (BES) is discussed and explained. CPLs, usually, cause instability issues for DC/DC converters due to their negative impedance characteristic. The state-space averaged model analysis of the converter is performed and stability regions of the converter while feeding CPL and constant voltage load (CVL) are investigated. A dual-loop control method is utilized to stabilize the power electronic converter while providing constant power and regulating the output voltage to satisfy both CPL and CVL. Simulation in Matlab/Simulink environment is performed to verify the proposed control method.
{"title":"Stability analysis of a DC-DC converter for battery energy storage system feeding CPL","authors":"Seyed Ahmad Hamidi, A. Nasiri","doi":"10.1109/INTLEC.2015.7572343","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572343","url":null,"abstract":"In this paper, stability analysis of a typical DC/DC Boost converter feeding a Constant Power Load (CPL) with and without a Battery Energy Storage (BES) is discussed and explained. CPLs, usually, cause instability issues for DC/DC converters due to their negative impedance characteristic. The state-space averaged model analysis of the converter is performed and stability regions of the converter while feeding CPL and constant voltage load (CVL) are investigated. A dual-loop control method is utilized to stabilize the power electronic converter while providing constant power and regulating the output voltage to satisfy both CPL and CVL. Simulation in Matlab/Simulink environment is performed to verify the proposed control method.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116116862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572345
Soon-Ryung Lee, Seung-Ho Baek, C. Won
In this paper, serial multi-module UPS system control considering battery module balancing is proposed. Because of the organization, the UPS system has some properties. One of them is output voltage is sum of each UPS module output voltage. Thus, each UPS module output voltage respective control can accomplish each battery module balancing according to SOCs of each battery module. As SOC is high or low, output power of each module is controlled proportionally to equalize SOC of the battery modules. And the reference of the output powers is compensated according to magnitude of SOC difference. Eventually, utilization of the batteries can be increased by preventing over-charge and over-discharge problem. The proposed control is verified by simulation and experimental result.
{"title":"Serial multi-module UPS system control method considering battery module balancing","authors":"Soon-Ryung Lee, Seung-Ho Baek, C. Won","doi":"10.1109/INTLEC.2015.7572345","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572345","url":null,"abstract":"In this paper, serial multi-module UPS system control considering battery module balancing is proposed. Because of the organization, the UPS system has some properties. One of them is output voltage is sum of each UPS module output voltage. Thus, each UPS module output voltage respective control can accomplish each battery module balancing according to SOCs of each battery module. As SOC is high or low, output power of each module is controlled proportionally to equalize SOC of the battery modules. And the reference of the output powers is compensated according to magnitude of SOC difference. Eventually, utilization of the batteries can be increased by preventing over-charge and over-discharge problem. The proposed control is verified by simulation and experimental result.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115818998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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